MCQ Ultrasound and Human Ear Chapter 12 Class 9 Science

MCQ’s For All Chapters – Science Class 9th

1. There will be total 14 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Which waves are employed in SONAR?

X rays

Ultrasonic Wave

Sonar wave

Infrasonic Wave

Question 1 of 14

2. A ship sends sonar and receives an echo after 2 seconds. If the speed of sound waves in water is 1500 m/s, then the depth of the sea is

1500 m

500 m

750 m

1000 m

Question 2 of 14

3. The vibrations or the pressure variations inside the inner ear are converted into electrical signals by the:

Nerves

Hammer, anvil and stirrup

Cochlea

Pinna

Question 3 of 14

4. Which part of the ear amplifies the vibrations of eardrum?

hammer, anvil and stirrup

Pinna

Cochlea

Auditory nerves

Question 4 of 14

5. Sound of the frequency below 20 Hz is known as

Infrasonic

Ultrasonic

Echo

Sonar

Question 5 of 14

6. The technique used by bats to find their way or to locate food is

Flapping

SONAR

Echo-location

RADAR

Question 6 of 14

7. Ultrasound is not used to:

detect defective foetus.

find the distance of the building.

clean spiral tubes.

as a tool in the treatment of muscular pain.

Question 7 of 14

8. Young children below 5 year can hear up to a frequency of

25 KHz

20 KHz

40 KHz

30 KHz

Question 8 of 14

9. The velocity of ultrasonic sound in water is 1400 m. The depth of the ocean as detected by SONAR, if the time taken to receive the reflected wave is 15s, is

1050 m

105 m

10.5 km

21 km

Question 9 of 14

10. A ship on the surface of water sends a signal and receives it back after 4 seconds from a submarine inside the water. Calculate the distance of the submarine from the ship (The speed of sound in water is 1450 m/s).

290 km

29 km

2900 km

2.9 km

Question 10 of 14

11. Assertion : Audible sound lies in the range of 20 to 200 Hz.
Reason : Infrasonic sound or Infra-sound has frequency less than 20 Hz.

Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

Assertion is true but Reason is false.

Assertion is false but Reason is true

Question 11 of 14

12. Assertion : Pitch of a note depends upon its wavelength.
Reason : Sound can not travel through vacuum.

Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

Assertion is true but Reason is false.

Assertion is false but Reason is true

Question 12 of 14

13. Assertion : The particles do not travel all the way from the vibrating object to the ear.
Reason : A particle of the medium in contact with the vibrating object is first displaced from its equilibrium position.

Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

Assertion is true but Reason is false.

Assertion is false but Reason is true

Question 13 of 14

14. Assertion : Ultrasounds can be used to detect cracks and flaws in metal blocks.
Reason : In stethoscopes the sound of the patient’s heartbeat reaches the doctor’s ears by multiple reflection of sound.

Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

Assertion is true but Reason is false.

Assertion is false but Reason is true

Question 14 of 14

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